from new game to:
complete main quest up till you can buy a house
leveling to 15 via exploits (attacking your buddy in the first dungeon, sneaking into a wall, balck briar mead speech glitch, etc)
gaining money to buy and furnish house (i uninstall patches and use the infinite gates of oblivion book glitch)
complete the infinium quest (sprint through the dungeon in about 10min, liars retreat for blood)
infinium glitch (repeated reading bookshelf etc.)
takes about 6 hours for me from start menu, and im sure if i tried to do it as fast as i could i could get done in under 5 hours. thats not the fastest thing in the world to do, but i think its well worth the reward considering how long it would take normally.
4-5 hours if you push it and move as fast as you can and that's doing the ogham glitch, gathering alchemy ingredients, and doing the restoration potion loop with the end result being a Lv.81.5 with equipment that has stats like 300-500 hit damage on all weapons and an armor rating of 2000+ depending on how "god like " you want to be. I like to do it cause you hit the ground running as it were, you can quest to your harts content with out having to grind out skills to make that play through feel like the class you made.
Don't get me wrong I do play legit as well which is fun and challenging in it's own right but I need at least one toon for fooling around.